Scott Anderson
7 years ago
parent
46823152ea
commit
fb93628bda
@ -1,252 +0,0 @@
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#define _POSIX_C_SOURCE 200809L
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#include <libudev.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include <xf86drm.h>
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#include <xf86drmMode.h>
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#include <wayland-server.h>
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#include <wlr/backend/session.h>
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#include <wlr/util/log.h>
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#include "backend/udev.h"
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/* Tests if 'path' is KMS compatible by trying to open it.
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* It leaves the open device in *fd_out it it succeeds.
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*/
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static bool device_is_kms(struct wlr_session *restrict session,
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const char *restrict path, int *restrict fd_out) {
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int fd;
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if (!path) {
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return false;
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}
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fd = wlr_session_open_file(session, path);
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if (fd < 0) {
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return false;
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}
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drmModeRes *res = drmModeGetResources(fd);
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if (!res) {
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goto out_fd;
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}
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if (res->count_crtcs <= 0 || res->count_connectors <= 0 ||
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res->count_encoders <= 0) {
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goto out_res;
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}
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if (*fd_out >= 0) {
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wlr_session_close_file(session, *fd_out);
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}
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*fd_out = fd;
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drmModeFreeResources(res);
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return true;
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out_res:
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drmModeFreeResources(res);
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out_fd:
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wlr_session_close_file(session, fd);
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return false;
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}
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/* Tries to find the primary GPU by checking for the "boot_vga" attribute.
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* If it's not found, it returns the first valid GPU it finds.
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*/
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int wlr_udev_find_gpu(struct wlr_udev *udev, struct wlr_session *session) {
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struct udev_enumerate *en = udev_enumerate_new(udev->udev);
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if (!en) {
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wlr_log(L_ERROR, "Failed to create udev enumeration");
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return -1;
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}
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udev_enumerate_add_match_subsystem(en, "drm");
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udev_enumerate_add_match_sysname(en, "card[0-9]*");
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udev_enumerate_scan_devices(en);
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struct udev_list_entry *entry;
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int fd = -1;
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udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(en)) {
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bool is_boot_vga = false;
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const char *path = udev_list_entry_get_name(entry);
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struct udev_device *dev = udev_device_new_from_syspath(udev->udev, path);
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if (!dev) {
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continue;
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}
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/*
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const char *seat = udev_device_get_property_value(dev, "ID_SEAT");
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if (!seat)
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seat = "seat0";
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if (strcmp(session->seat, seat) != 0) {
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udev_device_unref(dev);
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continue;
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}
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*/
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// This is owned by 'dev', so we don't need to free it
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struct udev_device *pci =
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udev_device_get_parent_with_subsystem_devtype(dev, "pci", NULL);
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if (pci) {
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const char *id = udev_device_get_sysattr_value(pci, "boot_vga");
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if (id && strcmp(id, "1") == 0) {
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is_boot_vga = true;
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}
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}
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// We already have a valid GPU
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if (!is_boot_vga && fd >= 0) {
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udev_device_unref(dev);
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continue;
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}
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path = udev_device_get_devnode(dev);
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if (!device_is_kms(session, path, &fd)) {
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udev_device_unref(dev);
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continue;
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}
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udev_device_unref(dev);
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// We've found the primary GPU
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if (is_boot_vga) {
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break;
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}
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}
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udev_enumerate_unref(en);
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return fd;
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}
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static int udev_event(int fd, uint32_t mask, void *data) {
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struct wlr_udev *udev = data;
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struct udev_device *dev = udev_monitor_receive_device(udev->mon);
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if (!dev) {
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return 1;
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}
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const char *action = udev_device_get_action(dev);
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wlr_log(L_DEBUG, "udev event for %s (%s)",
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udev_device_get_sysname(dev), action);
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if (!action || strcmp(action, "change") != 0) {
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goto out;
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}
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dev_t devnum = udev_device_get_devnum(dev);
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struct wlr_udev_dev *signal;
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wl_list_for_each(signal, &udev->devices, link) {
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if (signal->dev == devnum) {
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wl_signal_emit(&signal->invalidate, udev);
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break;
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}
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}
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out:
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udev_device_unref(dev);
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return 1;
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}
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struct wlr_udev *wlr_udev_create(struct wl_display *display) {
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struct wlr_udev *udev = calloc(sizeof(struct wlr_udev), 1);
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if (!udev) {
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return NULL;
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}
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udev->udev = udev_new();
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if (!udev->udev) {
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wlr_log(L_ERROR, "Failed to create udev context");
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goto error;
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}
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udev->mon = udev_monitor_new_from_netlink(udev->udev, "udev");
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if (!udev->mon) {
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wlr_log(L_ERROR, "Failed to create udev monitor");
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goto error_udev;
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}
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udev_monitor_filter_add_match_subsystem_devtype(udev->mon, "drm", NULL);
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udev_monitor_enable_receiving(udev->mon);
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struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
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int fd = udev_monitor_get_fd(udev->mon);
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udev->event = wl_event_loop_add_fd(event_loop, fd, WL_EVENT_READABLE,
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udev_event, udev);
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if (!udev->event) {
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wlr_log(L_ERROR, "Failed to create udev event source");
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goto error_mon;
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}
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wl_list_init(&udev->devices);
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wlr_log(L_DEBUG, "Successfully initialized udev");
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return udev;
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error_mon:
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udev_monitor_unref(udev->mon);
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error_udev:
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udev_unref(udev->udev);
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error:
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free(udev);
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return NULL;
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}
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void wlr_udev_destroy(struct wlr_udev *udev) {
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if (!udev) {
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return;
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}
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struct wlr_udev_dev *dev, *tmp;
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wl_list_for_each_safe(dev, tmp, &udev->devices, link) {
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free(dev);
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}
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wl_event_source_remove(udev->event);
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udev_monitor_unref(udev->mon);
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udev_unref(udev->udev);
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free(udev);
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}
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bool wlr_udev_signal_add(struct wlr_udev *udev, dev_t dev, struct wl_listener *listener) {
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struct wlr_udev_dev *device = malloc(sizeof(*device));
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if (!device) {
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wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
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return false;
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}
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device->dev = dev;
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wl_signal_init(&device->invalidate);
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wl_signal_add(&device->invalidate, listener);
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wl_list_insert(&udev->devices, &device->link);
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return true;
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}
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void wlr_udev_signal_remove(struct wlr_udev *udev, struct wl_listener *listener) {
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if (!udev || !listener) {
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return;
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}
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struct wlr_udev_dev *dev, *tmp;
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wl_list_for_each_safe(dev, tmp, &udev->devices, link) {
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// The signal should only have a single listener
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if (wl_signal_get(&dev->invalidate, listener->notify) != NULL) {
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wl_list_remove(&dev->link);
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free(dev);
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return;
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}
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}
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}
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@ -1,29 +0,0 @@
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#ifndef _WLR_INTERNAL_UDEV_H
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#define _WLR_INTERNAL_UDEV_H
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#include <sys/types.h>
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#include <libudev.h>
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#include <wlr/backend/session.h>
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#include <wayland-server.h>
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#include <wlr/backend/udev.h>
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struct wlr_udev_dev {
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dev_t dev;
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struct wl_signal invalidate;
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struct wl_list link;
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};
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struct wlr_udev {
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struct udev *udev;
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struct udev_monitor *mon;
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struct wl_event_source *event;
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struct wl_list devices;
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};
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int wlr_udev_find_gpu(struct wlr_udev *udev, struct wlr_session *session);
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bool wlr_udev_signal_add(struct wlr_udev *udev, dev_t dev, struct wl_listener *listener);
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void wlr_udev_signal_remove(struct wlr_udev *udev, struct wl_listener *listener);
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#endif
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@ -1,9 +0,0 @@
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#ifndef _WLR_BACKEND_UDEV_H
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#define _WLR_BACKEND_UDEV_H
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struct wlr_udev;
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struct wlr_udev *wlr_udev_create(struct wl_display *display);
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void wlr_udev_destroy(struct wlr_udev *udev);
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#endif
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